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An experimental study of highly transient squeeze-film flows
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10.1063/1.4811397
/content/aip/journal/pof2/25/6/10.1063/1.4811397
http://aip.metastore.ingenta.com/content/aip/journal/pof2/25/6/10.1063/1.4811397

Figures

Image of FIG. 1.
FIG. 1.

Geometry of parallel disk arrangement.

Image of FIG. 2.
FIG. 2.

(a) Components of test cell. (b) Test cell assembly. (c) Location of pressure transducers on lower disk. (a) and (b) reprinted with permission from E. A. Moss, A. Krassnokustki, B. W. Skews, and R. T. Paton, J. Fluid Mech.671, 384 (Year: 2011)10.1017/S0022112010005756. Copyright 2011, Cambridge University Press.

Image of FIG. 3.
FIG. 3.

Variations with drop height of the ideal velocity of the dropped mass , calculated from drop height; the corresponding effective velocity established on the basis of the energy dissipated; and the efficiency η, that is the ratio of energy dissipated to potential energy prior to the mass being dropped, for = 10 mm and = 30 kg.

Image of FIG. 4.
FIG. 4.

Experimentally derived quantities corresponding to the test ( = 200 mm, ≃ 10 mm, = 30 kg): (a) variations of pressures ( , , to ) and disk separation () with time () (thinner lines adjacent to the trace are uncertainty bounds); (b) variations of pressure measured at the centre of the lower disk ( ), disk velocity ( ), and disk acceleration ( ), with time ().

Image of FIG. 5.
FIG. 5.

(a) Variations of pressures with time at the centre of the lower disk, showing comparisons between measurements ( ) and predictions ( , , ) for the reference test ( = 200 mm, ≃ 10 mm, = 30 kg). (b) As for (a), but emphasizing the preliminary pressure spike (1).

Image of FIG. 6.
FIG. 6.

Measured variations of pressure force ( ), reaction force of dropped mass onto upper disk assembly ( ), and force accelerating the lower mass ( ) with (a) time and (b) disk separation () for = 200 mm, ≃ 10 mm, and = 30 kg.

Image of FIG. 7.
FIG. 7.

Measured variations of pressure force ( ), reaction force of dropped mass onto upper disk assembly ( ) and force accelerating the lower mass ( ) with (a) time and (b) disk separation () for = 700 mm, ≃ 10 mm, and = 30 kg.

Image of FIG. 8.
FIG. 8.

Measured variations of pressure force ( ), reaction force of dropped mass onto upper disk assembly ( ) and force accelerating the lower mass ( ) with (a) time and (b) disk separation () for = 500 mm, ≃ 10 mm, and = 50 kg.

Image of FIG. 9.
FIG. 9.

Measured variations of pressure force ( ), reaction force of dropped mass onto upper disk assembly ( ) and force accelerating the lower mass ( ) with (a) time and (b) disk separation () for = 500 mm, ≃ 4 mm, and = 30 kg.

Image of FIG. 10.
FIG. 10.

Variations of measured dimensionless pressures ( / , / ) with radial position / for the main and preliminary pressure spikes, respectively, showing a parabolic pressure distribution for comparative purposes.

Image of FIG. 11.
FIG. 11.

(a) Variations of pressure with disk separation and radial position for = 200 mm, ≃ 10 mm, and = 30 kg. (b) As for (a), but embracing a range of that emphasizes the preliminary pressure spike.

Image of FIG. 12.
FIG. 12.

(a) Variations of pressure with disk separation and radial position for = 700 mm, ≃ 10 mm, and = 30 kg. (b) As for (a), but embracing a range of that emphasizes the preliminary pressure spike.

Image of FIG. 13.
FIG. 13.

(a) Variations of pressure with disk separation and radial position for = 500 mm, ≃ 10 mm, and = 50 kg. (b) As for (a), but embracing a range of that emphasizes the preliminary pressure spike.

Image of FIG. 14.
FIG. 14.

(a) Variations of pressure with disk separation and radial position for = 500 mm, ≃ 4 mm, and = 30 kg. (b) As for (a), but embracing a range of that emphasizes the preliminary pressure spike.

Image of FIG. 15.
FIG. 15.

Variations of (a) measured ( ) and (b) predicted ( ) pressures at the centre of the lower disk, with drop height , and disk separation , for ≃ 10 mm and = 30 kg.

Image of FIG. 16.
FIG. 16.

Variations of (a) measured ( ) and (b) predicted ( ) pressures at the centre of the lower disk, with drop height , and disk separation , for ≃ 10 mm and = 30 kg, emphasizing the preliminary pressure spike.

Image of FIG. 17.
FIG. 17.

Variations of measured and predicted maximum pressures at the centre of the lower disk ( and ) with initial disk separation during: (a) the major and (b) preliminary pressure spikes, respectively, for = 30 kg and = 500 mm. The solid lines are power law least square regression fits to the sets of data.

Image of FIG. 18.
FIG. 18.

Variations of measured and predicted maximum pressures at the centre of the lower disk ( and ) with impact mass during (a) the major and (b) preliminary pressure spikes, respectively, for ≃ 10 mm and = 500 mm. The solid lines are power law least square regression fits to the sets of data.

Image of FIG. 19.
FIG. 19.

Variations of measured and predicted maximum pressures at the centre of the lower disk ( and ) with drop height during: (a) the major and (b) preliminary pressure spikes, respectively, for = 30 kg and ≃ 10 mm. The solid lines are power law least square regression fits to the sets of data.

Tables

Generic image for table
Table I.

Range of parameters covered during testing, with the bold numbers representing the values at which two of the parameters were fixed while varying the third.

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/content/aip/journal/pof2/25/6/10.1063/1.4811397
2013-06-24
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: An experimental study of highly transient squeeze-film flows
http://aip.metastore.ingenta.com/content/aip/journal/pof2/25/6/10.1063/1.4811397
10.1063/1.4811397
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